Why Thank you HGW,
I'm very glad to read it made you smile... I must be doing something good
HB , oh yes I do similar things but the best tool I found is a steel wire brush ( the type they use to clean metal before welding & hurts like hell if you manage to hit your other hand with !!!)
you can also insert bits of chicken wire to simulate steel rebar.
OR
give it to him.....

Just imagine the amount of realistic damage he can do to your terrain/models !!!
This is just a joke obviously & I couldn't not share but the look on that dog's face is priceless ( wicked some might say

).
And you will smile for sure.
Z